The RockShox Unterrohr SID RLC (A1), XX/RL (B1) is a genuine lower leg assembly designed specifically for RockShox SID RLC and SID XX/RL forks of the indicated generations. As an original RockShox spare part, it ensures perfect compatibility with your existing chassis, damper, and air spring, restoring the precise performance and responsiveness that SID forks are known for. Whether you are refreshing a well‑used race fork or repairing crash damage, this lower leg unit provides a solid foundation for smooth, controlled suspension action on demanding XC and marathon trails.
Using an original RockShox Unterrohr helps maintain correct bushing alignment, oil flow, and seal seating, which are all critical for small‑bump sensitivity and long‑term durability. It is ideal for riders who want to extend the life of their high‑end SID fork instead of replacing the entire unit. Pair it with fresh seals and the recommended RockShox suspension fluids for a complete service that brings back consistent performance, reliable lockout function, and precise steering control. This is the right choice for riders who value factory fit, proven reliability, and race‑ready suspension feel.